The simple of it is, it's using the intense energy of some 200 laser beams focused on a single target the size of a few grains of rice filled with hydrogen fuel.
Enpoquesparaules...  ...s 'aplicalaintensaenergiad'uns  200raigslàser enun objectiudela  midad 'uns grans d'arròs  Plens de combustible d'hidrogen.